As long as you are reasonably competent you are ready to join a band. I`ve been getting away with it for years
If you are going to audition for a covers band, get the set list well before hand and practice it. Usually an audition is 6 songs or something like that. Be confident, be pleasant, know the material and more importantly, enjoy yourself. Don`t worry about making mistakes, we all do it.
And Marvin, I don`t know how to play All right now either!! Never benn asked to play it in any band. Thought I was the only one.
Jez